Hi, I am new to the forum. So here goes. I was diagnosed with Parsonage Turner Syndrome in October. I was in the ER with severe pain, and the doc gave me a mega dose of Morphine IV. Anyway, then I went on Vicodin 7.5, didn't touch the pain, then I was prescribed Fentynl Patches, first at the lowest dose of 2.5, all the way up to 7.5, I am now weaning off to the 2.5 again, but am having HORRIFIC withdrawl symptoms, like shivering, and anxiety. The doc gave me Xanax o.25mg.